Just before sunset on Sunday evening, millions of people across the western U.S. and around the world watched the annular solar eclipse. Here, Japanese school children use specially designed eye glasses to observe the eclipse, also known as 'Ring of Fire,' in Tokorozawa, Japan.

Just before sunset on Sunday evening, millions of people across the western U.S. and around the world watched the annular solar eclipse. Here, Japanese school children use specially designed eye glasses to observe the eclipse, also known as 'Ring of Fire,' in Tokorozawa, Japan.

Although not quite a total eclipse—one in which the moon's shadow completely covers the sun—this 'Ring of Fire' temporarily blocked up to 86% of the sun. Here's a look at the annular eclipse in the sky of Taipei.

Although not quite a total eclipse—one in which the moon's shadow completely covers the sun—this 'Ring of Fire' temporarily blocked up to 86% of the sun. Here's a look at the annular eclipse in the sky of Taipei.

This time-lapse image shows the annular solar eclipse seen from Tokyo. For the first time in 932 years, a swathe of the country was able to see the eclipse blocking out all but an outer circle of light.

This time-lapse image shows the annular solar eclipse seen from Tokyo. For the first time in 932 years, a swathe of the country was able to see the eclipse blocking out all but an outer circle of light.

Although solar eclipses happen regularly around the world, this eclipse was the first in the continental U.S. in more than 18 years. Here, hikers watch the 'Ring of Fire' from Papago Park in Phoenix, Ariz.

Although solar eclipses happen regularly around the world, this eclipse was the first in the continental U.S. in more than 18 years. Here, hikers watch the 'Ring of Fire' from Papago Park in Phoenix, Ariz.